[cmake] more modules, general "cleanup" (#3126)

Successor to that old MoltenVK PR. Does a lot of cleanups within root CMakeLists.txt, hands over MoltenVK and VulkanValidationLayers to CPMUtil, and separates out common operations into my modules.

Hopefully reduces the monstrosity that is root CMakeLists.txt. Please test:

- builds on all platforms
- VulkanValidationLayers

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3126
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>

tools/cpm/check-updates.sh

@@ -8,10 +8,14 @@
 
 RETURN=0
 
-filter() {
+filter_out() {
 	TAGS=$(echo "$TAGS" | jq "[.[] | select(.name | test(\"$1\"; \"i\") | not)]")
 }
 
+filter_in() {
+	TAGS=$(echo "$TAGS" | jq "[.[] | select(.name | test(\"$1\"; \"i\"))]")
+}
+
 usage() {
 	cat << EOF
 Usage: $0 [uf] [PACKAGE]...
@@ -83,19 +87,27 @@ while true; do
 	# filter out some commonly known annoyances
 	# TODO add more
 
-	filter vulkan-sdk # vulkan
-	filter yotta      # mbedtls
+	if [ "$PACKAGE" = "vulkan-validation-layers" ]; then
+		filter_in vulkan-sdk
+	else
+		filter_out vulkan-sdk
+	fi
+
+	[ "$CI" = "true" ] && filter_in "-"
+
+	filter_out yotta # mbedtls
 
 	# ignore betas/alphas (remove if needed)
-	filter alpha
-	filter beta
-	filter rc
+	filter_out alpha
+	filter_out beta
+	filter_out rc
 
 	# Add package-specific overrides here, e.g. here for fmt:
-	[ "$PACKAGE" = fmt ] && filter v0.11
+	[ "$PACKAGE" = fmt ] && filter_out v0.11
 
 	LATEST=$(echo "$TAGS" | jq -r '.[0].name')
 
+	[ "$LATEST" = "null" ] && echo "-- * Up-to-date" && continue
 	[ "$LATEST" = "$TAG" ] && [ "$FORCE" != "true" ] && echo "-- * Up-to-date" && continue
 
 	RETURN=1

tools/cpm/download.sh

@@ -20,10 +20,13 @@ download_package() {
     ACTUAL_HASH=$("${HASH_ALGO}"sum "$OUTFILE" | cut -d" " -f1)
     [ "$ACTUAL_HASH" != "$HASH" ] && echo "!! $FILENAME did not match expected hash; expected $HASH but got $ACTUAL_HASH" && exit 1
 
+	TMPDIR="$TMP/extracted"
     mkdir -p "$OUTDIR"
+	mkdir -p "$TMPDIR"
 
 	PREVDIR="$PWD"
-    cd "$OUTDIR"
+	mkdir -p "$TMPDIR"
+    cd "$TMPDIR"
 
     case "$FILENAME" in
         (*.7z)
@@ -44,11 +47,16 @@ download_package() {
     # thanks gnu
     if [ "$(echo "$DIRS" | wc -l)" -eq 2 ]; then
         SUBDIR=$(find . -maxdepth 1 -type d -not -name ".")
-        mv "$SUBDIR"/* .
-        mv "$SUBDIR"/.* . 2>/dev/null || true
+        mv "$SUBDIR"/* "$OUTDIR"
+        mv "$SUBDIR"/.* "$OUTDIR" 2>/dev/null || true
         rmdir "$SUBDIR"
+	else
+        mv ./* "$OUTDIR"
+        mv ./.* "$OUTDIR" 2>/dev/null || true
     fi
 
+	cd "$OUTDIR"
+
     if echo "$JSON" | grep -e "patches" > /dev/null; then
         PATCHES=$(echo "$JSON" | jq -r '.patches | join(" ")')
         for patch in $PATCHES; do